Method and system for light emitting device displays
First Claim
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1. A display system comprising:
- multiple pixels arranged in a matrix of rows and columns, each of said pixels having a light emitting device, a drive transistor for driving the light emitting device, and a switch transistor for selecting the pixel; and
a power supply line for each of said multiple rows of pixels and coupled to said drive transistor in each of said pixels,multiple select lines for selecting said rows of said pixels in said matrix,multiple data lines for supplying calibration voltages and display data to said columns of pixels in said matrix,a current source for supplying current to the drive transistor of a selected pixel via said power supply line or one of said data lines so that said drive transistor functions as a voltage amplifier to produce an amplified voltage that corresponds to a characteristic of said selected pixel that varies with the age of that pixel, said amplified voltage amplifying any shift in said characteristic of said selected pixel, andcircuitry for detecting said amplified voltage and using that detected amplified voltage to determine an adjustment of the calibration voltage for said selected pixel.
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Abstract
A method and system for light emitting device displays is provided. The system includes one or more pixels, each having a light emitting device, a drive transistor for driving the light emitting device, and a switch transistor for selecting the pixel; and a circuit for monitoring and extracting the change of the pixel to calibrate programming data for the pixel. Programming data is calibrated using the monitoring result.
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Citations
20 Claims
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1. A display system comprising:
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multiple pixels arranged in a matrix of rows and columns, each of said pixels having a light emitting device, a drive transistor for driving the light emitting device, and a switch transistor for selecting the pixel; and a power supply line for each of said multiple rows of pixels and coupled to said drive transistor in each of said pixels, multiple select lines for selecting said rows of said pixels in said matrix, multiple data lines for supplying calibration voltages and display data to said columns of pixels in said matrix, a current source for supplying current to the drive transistor of a selected pixel via said power supply line or one of said data lines so that said drive transistor functions as a voltage amplifier to produce an amplified voltage that corresponds to a characteristic of said selected pixel that varies with the age of that pixel, said amplified voltage amplifying any shift in said characteristic of said selected pixel, and circuitry for detecting said amplified voltage and using that detected amplified voltage to determine an adjustment of the calibration voltage for said selected pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of driving a display system comprising multiple pixels arranged in a matrix of rows and columns, each of said pixels having a light emitting device, a drive transistor for driving the light emitting device, and a switch transistor for selecting the pixel, the method comprising
selecting rows of said pixels in said matrix, supplying calibration voltages and display data to columns of pixels in said matrix, supplying current to the drive transistor of a selected pixel from a current source via said power supply line or one of said data lines so that said drive transistor functions as a voltage amplifier to produce an amplified voltage that corresponds to a characteristic of said selected pixel that varies with the age of that pixel, said amplified voltage amplifying any shift in said characteristic of said selected pixel, and detecting said amplified voltage and using that detected amplified voltage to determine an adjustment of the calibration voltage for said selected pixel.
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19. A display system comprising:
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multiple pixels arranged in a matrix of rows and columns, each of said pixels having a light emitting device, a drive transistor for driving the light emitting device, and a switch transistor for selecting the pixel; and a power supply line for each of said multiple rows of pixels and coupled to said drive transistor in each of said pixels, multiple select lines for selecting said rows of said pixels in said matrix, multiple data lines for supplying calibration voltages and display data to said columns of pixels in said matrix, an output data line coupled to at least one of the light emitting device and the drive transistor, a current source for supplying current to the drive transistor of a selected pixel via said output data line so that said drive transistor functions as a voltage amplifier to produce an amplified voltage that corresponds to a characteristic of said selected pixel that varies with the age of that pixel, said amplified voltage amplifying any shift in said characteristic of said selected pixel, and circuitry for detecting said amplified voltage and using that detected amplified voltage to determine an adjustment of the calibration voltage for said selected pixel. - View Dependent Claims (20)
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Specification